Device, system and method of transferring a wireless communication session between wireless communication frequency bands

ABSTRACT

Some demonstrative embodiments include coordinating a session transfer between first and second multi-band wireless communication devices capable of communicating over at least first and second wireless communication frequency bands, wherein at least one device uses the same medium access control (MAC) address in both the first and second wireless communication frequency bands.

CROSS REFERENCE TO RELATED DOCUMENTS

This application is a continuation of U.S. patent application Ser. No.12/551,614, filed Sep. 1, 2009, and claims priority to that filing datefor all applicable subject matter.

BACKGROUND

Wireless communication over Extremely high frequency (EHF) communicationbands (mmwave frequency bands), e.g., of between 30 Gigahertz (GHz) and300 GHz, may provide relatively high throughputs. However communicationlink over the mmwave frequency band may be less robust than acommunication link operating over a lower frequency band, e.g., a 2.4GHz or 5 GHz (“2.4/5 GHz”) frequency band, for example, due to oxygenabsorption.

BRIEF DESCRIPTION OF THE DRAWINGS

For simplicity and clarity of illustration, elements shown in thefigures have not necessarily been drawn to scale. For example, thedimensions of some of the elements may be exaggerated relative to otherelements for clarity of presentation. Furthermore, reference numeralsmay be repeated among the figures to indicate corresponding or analogouselements. The figures are listed below.

FIG. 1 is a schematic block diagram illustration of a system inaccordance with some demonstrative embodiments.

FIG. 2 is a schematic illustration of a multi-band information-element,in accordance with some demonstrative embodiments.

FIG. 3 is a schematic illustration of a session transfer request frame,in accordance with some demonstrative embodiments.

FIG. 4 is a schematic illustration of a session transfer response frame,in accordance with some demonstrative embodiments.

FIG. 5 is a schematic flow-chart illustration of a method oftransferring a wireless communication session between first and secondwireless communication frequency bands, in accordance with somedemonstrative embodiments.

FIG. 6 is a schematic block diagram illustration of an article ofmanufacture, in accordance with some demonstrative embodiments.

DETAILED DESCRIPTION

In the allowing detailed description, numerous specific details are setforth in order to provide a thorough understanding of some embodiments.However, it will be understood by persons of ordinary skill in the artthat some embodiments may be practiced without these specific details.In other instances, well-known methods, procedures, components, unitsand/or circuits have not been described in detail so as not to obscurethe discussion.

Discussions herein utilizing terms such as, for example, “processing”,“computing”, “calculating”, “determining”, “establishing,” “analyzing”,“checking”, or the like, may refer to operation(s) and/or process(es) ofa computer, a computing platform, a computing system, or otherelectronic computing device, that manipulate and/or transform datarepresented as physical (e.g., electronic) quantities within thecomputer's registers and/or memories into other data similarlyrepresented as physical quantities within the computer's registersand/or memories or other information storage medium that may storeinstructions to perform operations and/or processes.

The terms “plurality” and “a plurality” as used herein include, forexample, “multiple” or “two or more”. For example, “a plurality ofitems” includes two or more items.

Some embodiments may be used in conjunction with various devices andsystems, for example, a Personal Computer (PC), a desktop computer, amobile computer, a laptop computer, a notebook computer, a tabletcomputer, a server computer, a handheld computer, a handheld device, aPersonal Digital Assistant (PDA) device, a handheld PDA device, anon-board device, an off-board device, a hybrid device, a vehiculardevice, a non-vehicular device, a mobile or portable device, a consumerdevice, a non-mobile or non-portable device, a wireless communicationstation, a wireless communication device a wireless Access Point (AP), awired or wireless router, a wired or wireless modem, a video device, anaudio device, an audio-video (A/V) device, a Set-Top-Box (STB), aBlu-ray disc (BD) player, a BD recorder, a Digital Video Disc (DVD)player, a High Definition (HD) DVD player, a DVD recorder, a HD DVDrecorder, a Personal Video Recorder (PVR), a broadcast HD receiver, avideo source, an audio source, a video sink, an audio sink, a stereotuner, a broadcast radio receiver, a flat panel display, a PersonalMedia Player (PMP), a digital video camera (DVC), a digital audioplayer, a speaker, an audio receiver, an audio amplifier, a gamingdevice, a data source, a data sink, a Digital Still camera (DSC), awired or wireless network, a wireless area network, a Wireless VideoArea Network (WVAN), a Local Area Network (LAN), a Wireless LAN (WLAN),a Personal Area Network (PAN), a Wireless PAN (WPAN), devices and/ornetworks operating in accordance with existing IEEE 802.11 (IEEE802.11-1999: Wireless LAN Medium Access Control (MAC) and Physical Layer(PHY) Specifications), 802.11a, 802.11b, 802.11g, 802.11b, 802.11j,802.11n, 802.11 task group ad (TGad), 802.16, 802.16d, 802.16e, 802.16f,standards and/or future versions and/or derivatives thereof, devicesand/or networks operating in accordance with existingWireless-Gigabit-Alliance (WGA) and/or WirelessHD™ specifications and/orfuture versions and/or derivatives thereof, units and/or devices whichare part of the above networks, one way and/or two-way radiocommunication systems, cellular radio-telephone communication systems, acellular telephone, a wireless telephone, a Personal CommunicationSystems (PCS) device, a PDA device which incorporates a wirelesscommunication device, a mobile or portable Global Positioning System(OPS) device, a device which incorporates a GPS receiver or transceiveror chip, a device which incorporates an RFID element or chip, a MultipleInput Multiple Output (MIMO) transceiver or device, a Single InputMultiple Output (SIMO) transceiver or device, a Multiple Input SingleOutput (MISO) transceiver or device, a device having one or moreinternal antennas and/or external antennas, Digital Video Broadcast(DVB) devices or systems, multi-standard radio devices or systems, awired or wireless handheld device (e.g., BlackBerry, Palm Treo), aWireless Application Protocol (WAP) device, or the like.

Some embodiments may be used in conjunction with one or more types ofwireless communication signals and/or systems, for example, RadioFrequency (RF), Infra Red (IR), Frequency-Division Multiplexing (FDM),Orthogonal EDM (OFDM), Time-Division Multiplexing (TDM), Time-DivisionMultiple Access (TDMA), Extended TDMA (E-TDMA), General Packet RadioService (GPRS), extended GPRS, Code-Division Multiple Access (CDMA),Wideband CDMA (WCDMA), CDMA 2000, single-carrier CDMA, multi-carrierCDMA, Multi-Carrier Modulation (MDM), Discrete Multi-Tone (DMT),Bluetooth®, Global Positioning System (GPS), Wi-Fi, Wi-Max ZigBee™,Ultra-Wideband (UWB), Global System for Mobile communication (GSM), 2G,2.5G, 3G, 3.5G. Enhanced Data rates for GSM Evolution (EDGE) or thelike. Other embodiments may be used in various other devices, systemsand/or networks.

The term “wireless device” as used herein includes, for example, adevice capable of wireless communication, a communication device capableof wireless communication, a communication station capable of wirelesscommunication, a portable or non-portable device capable of wirelesscommunication, or the like. In some demonstrative embodiments, awireless device may be or may include a peripheral that is integratedwith a computer, or a peripheral that is attached to a computer. In somedemonstrative embodiments, the term “wireless device” may optionallyinclude a wireless service.

Some demonstrative embodiments may be used in conjunction with suitablelimited-range or short-range wireless communication networks, forexample, a WLAN, a “piconet”, a WPAN, a WVAN and the like.

Some demonstrative embodiments are described herein with reference to afrequency band of 60 GHz. However, other embodiments may be implementedutilizing any other suitable wireless communication frequency bands, forexample, an Extremely High Frequency (EHF) band (the millimeter wave(mmwave) frequency band), e.g., a frequency band within the frequencyband of between 30 Ghz and 300 GHZ, a WLAN frequency band, a WPANfrequency band, a frequency band according to the IEEE 802.11, IEEE802.11TGad and/or WGA specifications, and the like.

Reference is now made to FIG. 1, which schematically illustrates a blockdiagram of a system 100 in accordance with some demonstrativeembodiments.

As shown in FIG. 1, in some demonstrative embodiments, system 100 mayinclude a wireless area network including one or more wirelesscommunication devices, e.g., wireless communication devices 102, 105and/or 106, capable of communicating content, data, information and/orsignals over one or more suitable wireless communication links, forexample, a radio channel, an IR channel, a RF channel, a WirelessFidelity (WiFi) channel, and the like. One or more elements of system100 may optionally be capable of communicating over any suitable wiredcommunication links.

In some demonstrative embodiments, wireless communication devices 102,105 and/or 106 may include, for example, a PC, a desktop computer, amobile computer, a laptop computer, a notebook computer, a tabletcomputer, a server computer, a handheld computer, a handheld device, aPDA device, a handheld PDA device, an on-board device, an off-boarddevice, a hybrid device (e.g., combining cellular phone functionalitieswith PDA device functionalities), a consumer device, a vehicular device,a non-vehicular device, a mobile or portable device, a non-mobile ornon-portable device, a cellular telephone, a PCS device, a PDA devicewhich incorporates a wireless communication device, a mobile or portableGPS device, a DVB device, a relatively small computing device, anon-desktop computer, a “Carry Small Live Large” (CSLL) device, an UltraMobile Device (UND), an Ultra Mobile PC (UMPC), a Mobile Internet Device(MID), an “Origami” device or computing device, a device that supportsDynamically Composable Computing (DCC), a context-aware device, a videodevice, an audio device, an A/V device, a STB, a BD player, a BDrecorder, a DVD player, a HD DVD player, a DVD recorder, a HD DVDrecorder, a PVR, a broadcast HD receiver, a video source, an audiosource, a video sink, an audio sink, a stereo tuner, a broadcast radioreceiver, a flat panel display, a PMP, DVC, a digital audio player, aspeaker, an audio receiver, a gaming device, an audio amplifier, a datasource, a data sink, a DSC, a media player, a Smartphone, a television,a music player, or the like.

In some demonstrative embodiments, wireless communication devices 102,105 and/or 106 may include a wireless communication unit 108 to performwireless communication with wireless communication devices 102, 105, 106and/or with one or more other wireless communication devices, e.g., asdescribed below. Wireless communication devices 102, 105 and/or 106 mayalso include, for example, one or more of a processor 120, an input unit112, an output unit 114, a memory unit 118, and a storage unit 116.Wireless communication devices 102, 105 and/or 106 may optionallyinclude other suitable hardware components and/or software components.In some demonstrative embodiments, some or all of the components of oneor more of wireless communication devices 102, 105 and/or 106 may beenclosed in a common housing or packaging, and may be interconnected oroperably associated using one or more wired or wireless links. In otherembodiments, components of one or more of wireless communication devices102, 105 and/or 106 may be distributed among multiple or separatedevices.

Processor 120 includes, for example, a Central Processing Unit (CPU), aDigital Signal Processor (DSP), one or more processor cores, asingle-core processor, a dual-core processor, a multiple-core processor,a microprocessor, a host processor, a controller, a plurality ofprocessors or controllers, a chip, a microchip, one or more circuits,circuitry, a logic unit, an Integrated Circuit (IC), anApplication-Specific IC (ASIC), or any other suitable multi-purpose orspecific processor or controller. Processor 120 executes instructions,for example, of an Operating System (OS) of wireless communicationdevice 106, and/or of one or more suitable applications.

Input unit 112 includes, for example, a keyboard, a keypad, a mouse, atouch-pad, a track-ball, a stylus, a microphone, or other suitablepointing device or input device. Output unit 114 includes, for example,a monitor, a screen, a flat panel display, a Cathode Ray Tube (CRT)display unit, at Liquid Crystal Display (LCD) display unit, a plasmadisplay unit, one or more audio speakers or earphones, or other suitableoutput devices.

Memory unit 118 includes, for example, a Random Access Memory (RAM), aRead Only Memory (ROM), a Dynamic RAM (DRAM), a Synchronous DRAM(SD-RAM), a flash memory, a volatile memory, a non-volatile memory, acache memory, a buffer, a short term memory unit, a long term memoryunit, or other suitable memory units. Storage unit 116 includes, forexample, a hard disk drive, a floppy disk drive, a Compact Disk (CD)drive, a CD-ROM drive, a DVD drive, or other suitable removable ornon-removable storage units. Memory unit 118 and/or storage unit 116,for example, may store data processed by wireless communication device106.

In some demonstrative embodiments, wireless communication unit 108includes, for example, one or more wireless transmitters, receiversand/or transceivers able to send and/or receive wireless communicationsignals, RF signals, frames, blocks, transmission streams, packets,messages, data items, and/or data. For example, wireless communicationunit 108 may include or may be implemented as part of a wireless NetworkInterface Card (NIC), and the like.

Wireless communication unit 108 may include, or may be associated with,one or more antennas or one or more sets of antennas 110. Antennas 110may include, for example, an internal and/or external RF antenna, adipole antenna, a monopole antenna, an omni-directional antenna, an endfed antenna, a circularly polarized antenna, a micro-strip antenna, adiversity antenna, or other type of antenna suitable for transmittingand/or receiving wireless communication signals, blocks, frames,transmission streams, packets, messages and/or data.

In some demonstrative embodiments, system 100 may perform thefunctionality of a multi-band wireless communication network. Forexample, wireless communication devices 102, 105 and/or 106 may includemulti-band wireless communication devices capable of communicating overtwo or more wireless communication frequency bands. For example,wireless communication unit 108 may include a multi-band wirelesscommunication unit capable of communicating over two or more wirelesscommunication frequency bands, for example, the mmwave frequency band,the 60 GHz frequency band, and the 2.4/5 GHz frequency band.

In some demonstrative embodiments, device 106 may be capable ofcommunicating with wireless communication devices 102, 105 and/or otherwireless communication devices over a first wireless communicationfrequency band, e.g., the 60 GHz frequency band; and communicating withwireless communication devices 102, 105 and/or other wirelesscommunication devices over a second wireless communication frequencyband e.g., the 2.4/5 GHz frequency band.

In some demonstrative embodiments, wireless communication device 105 mayperform the functionality of a suitable Access Point (AP) and Wirelesscommunication devices 102, 106 and/or any other wireless communicationdevice of system 100 may perform the functionality of a non-AP station,e.g., in accordance with the IEEE 802.11 specification. According tothis embodiment, wireless communication devices 102, 105 and/or 106 mayform a Basic-Service-Set (BSS), and device 105 may be capable ofmanaging communication between wireless communication devices 102 and106 over the 2.4/5 GHz frequency band.

In some demonstrative embodiments, wireless communication device 106 maycommunicate over the 60 GHz frequency band as part of any suitablePersonal-Independent-Basic-Service-Set (PBSS), WLAN, WPAN, WVAN,piconet, and/or any other suitable network. In one example, wirelesscommunication device 106 may perform the functionality of a controlpoint, e.g., a suitable PBSS Control Point (PCP), or a coordinator,e.g., as defined by the IEEE 802.11 and/or WGA specifications. Accordingto this example, wireless communication device 106 may controlcommunications of wireless communication devices 102, 105 and/or otherwireless communication devices over the 60 GHz frequency band. Inanother example, wireless communication device 106 may perform thefunctionality of a non-PCP station, while another device, e.g., wirelesscommunication device 102, 105 or another wireless communication device,may per form the functionality of the control point.

In some demonstrative embodiments, wireless communication device 106 maybe capable of coordinating, managing and/or performing a transfer of atleast one communication session with another wireless communicationdevice, e.g., device 102 and/or 105, between a first frequency band,e.g., the 60 GHz, 2.4 GHz or 5 Ghz frequency band, and a secondfrequency band, e.g., the 2.4 GHz, or 5 GHz or 60 Ghz frequency band, asdescribed in detail below.

The term “wireless communication session” as used herein may refer oneor more frames, including a common Traffic-Identifier (TID), transmittedbetween wireless communication devices of a wireless communicationnetwork, e.g., two devices belonging to the same BSS and/or PBSS.

The term “session transfer” as used herein may refer to transferring asession from the first frequency band to the second frequency band,e.g., from the 60 GHz frequency band to the 2.4/5 GHz frequency band,from the 5 GHz band to the 2.4 GHz band, from the 2.4/5 GHz band to the60 GHz band, and/or any combination thereof.

In some demonstrative embodiments, wireless communication unit 108 maybe capable of performing the session transfer through at least one offirst and second session-transfer operation modes. In the first mode(“the non-transparent mode”) session transfer between the first andsecond frequency bands may be handled above the Media Access Control(MAC) layer. In the second mode (“the transparent mode”), sessiontransfer between the first and second frequency bands may be handled inthe MAC layer such that the session transfer is “transparent” to higherlayers, e.g., as described below. For example, wireless communication108 may have the same Station Management Entity (SME) over both thefirst and second wireless communication frequency bands, e.g., ifwireless communication unit supports the transparent session transfermode.

In some demonstrative embodiments, wireless communication unit 108 mayinform wireless communication device 102 of one or more session-transfermodes supported by wireless communication unit 108, e.g., using amulti-band Information Element (IE), as described below.

In one demonstrative embodiment, wireless communication unit 108 may usethe same MAC address for identifying wireless communication unit 108during the at least one session over both the first and second frequencybands, e.g., if the session transfer is performed through thetransparent mode. The transparent mode may enable wireless communicationunit 108 to transfer, for example, a session, e.g., a web browsingsession, between the first and second wireless communication frequencybands, for example, without interrupting, restarting and/or disruptingthe session at an application-level, e.g., since an Internet-Protocol(IP) layer may keep using the same MAC address after the transfer of thesession.

In another demonstrative embodiment, wireless communication unit 108 mayuse a first MAC address to identify wireless communication unit 108during the communication session over the first wireless communicationfrequency band, and to use a second MAC address, different from thefirst MAC address, to identify wireless communication unit 108 during,the session over the second wireless communication frequency band.According to this embodiment, wireless communication unit 108 may becapable of informing wireless communication device 102 of the second MACaddress, for example, prior to transferring the session to the secondfrequency band, e.g., by including the second MAC address in amulti-band IE as described below.

In some demonstrative embodiments, wireless communication unit 108 maytransmit a multi-band IE to wireless communication device 102 over thefirst wireless communication frequency band. The multi-band IE mayinclude information relating to the operation and/or functionality ofwireless communication unit 108 over the second wireless communicationfrequency band, e.g., as described below. For example, the multi-band IEmay include information relating to the functionality and/or operationof wireless communication unit 108 over the 2.41/5 GHz frequency band,e.g., if wireless communication unit 108 transmits the multi-band IE inthe 60 GHz frequency band and/or the multi-band. IE may includeinformation relating to the functionality and/or operation of wirelesscommunication unit 108 over the 60 GHz frequency band, e.g., if wirelesscommunication unit 108 transmits the multi-band IE in the 2.4/5 GHzfrequency band.

In some demonstrative embodiments, wireless communication unit 108 maytransmit the multi-band IE as part of a session transfer frame, forexample, a session transfer request frame and/or a session transferresponse frame, e.g., as described below. Additionally or alternatively,wireless communication unit 108 may transmit the multi-band IE as partof any other suitable frame or transmission. For example, wirelesscommunication unit 108 may transmit the multi-band IE as part of abeacon, an association response, a probe response, an announce frame, aninformation request, an information response, a service request, e.g., ammWaveSTA service request, a service response, e.g., a mmWaveSTA serviceresponse, and the like, for example, if wireless communication unit 108performs the functionality of a PCP/AP. Wireless communication unit 108may transmit the multi-band IE as part of an association request, are-association request, a probe request, an information request, aninformation response, a service request, e.g., a mmWaveSTA servicerequest, a service response, e.g., a mmWaveSTA service response, and thelike, for example, if wireless communication unit 108 performs thefunctionality of a non-PCP/non-AP.

In some demonstrative embodiments, wireless communication unit 108 maytransmit more than one multi-band IE in a frame or transmission, e.g.,if wireless communication unit 108 supports communication over more thantwo wireless communication frequency bands. For example, wirelesscommunication unit may transmit a frame or transmission over a firstwireless communication frequency band including a first multi-band IEcorresponding to a second wireless communication frequency band and asecond multi-band IE corresponding to a third wireless communicationfrequency band, e.g., it wireless communication unit supportscommunication over the first, second and third wireless communicationfrequency bands.

Reference is made to FIG. 2, which schematically illustrates amulti-band IE 200, in accordance with some demonstrative embodiments. Insome demonstrative embodiments, multi-band IE 200 may be transmittedfrom a multi-band wireless communication unit, e.g., wirelesscommunication unit 108 (FIG. 1), to a wireless communication device(“the recipient wireless communication device”), e.g., Wirelesscommunication device 102 (FIG. 1). Multi-band IE 200 may be transmittedover a first wireless communication frequency band and may includeinformation relating to the operation and/or functionality of thewireless communication unit over a second wireless communicationfrequency band.

In some demonstrative embodiments, multi-band IE 200 may include amulti-band control field 202, e.g., having a size of one octet (eightbits) or any other suitable size.

In some demonstrative embodiments, multi-band control field 202 mayinclude a role field 203, e.g. having a size of one bit or any othersuitable size, indicating whether or not the wireless communication unitoperates as a controller over the second wireless communicationfrequency band. Wireless communication unit 108 (FIG. 1) may perform,for example, one or more roles over the first and/or second wirelesscommunication frequency bands. For example, wireless communication unit108 (FIG. 1) may perform the functionality of a PCP or a non-PCP stationin the 60 GHz frequency band, and/or may perform as a non-AP station inthe 2.4/5 GHz frequency band. In one embodiment, wireless communicationunit 108 (FIG. 1) may set role field 203 of IE 200, which is transmittedover the first wireless communication frequency band, to a first value,e.g., zero, if wireless communication unit 108 (FIG. 1) operates as anon-PCP/AP station in the second wireless communication frequency band;and to a second value, e.g., one, otherwise.

In some demonstrative embodiments, multi-band control field 202 mayinclude a reachability field 204, e.g., having a size of one bit or anyother suitable size, indicating whether or not the wirelesscommunication unit is able to receive frames from the recipient wirelesscommunication device over the second wireless communication frequencyband. For example, wireless communication unit 108 (FIG. 1) may usereachability field 204 of IE 200 which is transmitted over the firstwireless communication frequency band, to inform wireless communicationdevice 102 (FIG. 1) whether or not wireless communication unit 108(FIG. 1) is able to receive transmissions from wireless communicationdevice 102 (FIG. 1) over the second wireless communication frequencyband. In one embodiment, wireless communication unit 108 (FIG. 1) mayset reachability field 204 to a first value, e.g., zero, if wirelesscommunication unit 108 (FIG. 1) is not able to receive transmissionsfrom wireless communication device 102 (FIG. 1) over the second wirelesscommunication frequency band; and to a second value, e.g., one,otherwise. The value of reachability field 204 may not be set bycommunication unit 108 (FIG. 1) and/or may be ignored by the recipientwireless communication device, e.g., if multi-band IE 200 is transmittedas part of a broadcast frame intended for a plurality of recipientwireless communication devices.

Wireless communication unit 108 (FIG. 1) may implement any suitablemethod and/or algorithm to determine whether or not wirelesscommunication unit 108 (FIG. 1) is able to receive transmissions fromwireless communication device 102 (FIG. 1) over the second wirelesscommunication frequency band. In some demonstrative embodiments, uponreceiving a multi-band IE from the recipient wireless communicationdevice, wireless communication unit 108 (FIG. 1) may switch to a channelindicated by the received multi-band IE, and monitor the channel forframes from the recipient wireless communication device, for example, ifa Beacon Interval (BI) length field of the received multi-band IE isgreater than zero, e.g., as described below.

In some demonstrative embodiments, multi-band control field 202 mayinclude a session-transfer mode field 206, e.g., having a size of onebit or any other suitable size, indicating at least one session transferoperation mode supported by the wireless communication device, e.g., thetransparent session transfer mode and/or the non-transparent sessiontransfer mode. In one embodiment, session transfer mode field 206 mayhave a first value, e.g., zero, indicating that wireless communicationunit 108 (FIG. 1) supports the non-transparent session transfer mode; ora second value, e.g., one, indicating that wireless communication unit108 (FIG. 1) supports both the transparent and the non-transparentsession transfer modes.

In some demonstrative embodiments, multi-band IE 200 may optionallyinclude an indication of a MAC address to be used for identifying thewireless communication unit over the second wireless communicationfrequency band. In one embodiment, multi-band IE 200 may optionallyinclude a MAC address field 214, e.g., having a size of six octets orany other suitable size, to include the a MAC address to be used foridentifying the wireless communication unit over the second wirelesscommunication frequency band. In one embodiment, multi-band controlfield 202 may include a MAC-address indicator field 208, e.g., having asize of one bit or any other suitable size, indicating whether or notmulti-band IE 200 includes MAC address field 214. For example, wirelesscommunication unit 108 (FIG. 1) may set MAC-address indicator field 208to a first value, e.g., one, to indicate that multi-band IE 200 includesMAC address field 214, for example, if wireless communication unit is touse the MAC address of field 214 to identify wireless communication unit108 (FIG. 1) over the second wireless communication frequency band,e.g., if the non-transparent session transfer is performed; or a secondvalue, e.g., zero, to indicate that multi-band IE 200 does not includeMAC address field 214, for example, if wireless communication unit is touse the same MAC address, which is currently used over the firstwireless communication frequency band, to identify wirelesscommunication unit 108 (FIG. 1) over the second wireless communicationfrequency band, e.g., if the transparent session transfer is performed.

In some demonstrative embodiments, multi-band IE 200 may include achannel field 216, e.g., having a size of one octet or any othersuitable size, indicating a channel, e.g., a channel number, to be usedby the wireless communication device over the second wirelesscommunication frequency band. In one embodiment, multi-band controlfield 202 may include a channel active field 210, e.g., having a size ofone bit or any other suitable size, to indicate whether or not thewireless communication unit is operating (“active”) on the channelindicated by field 216. For example, channel active field 210 may have afirst value, e.g., one, indicating that the wireless communication unitis operating on the channel indicated by field 216; and a second value,e.g., zero, indicating that the wireless communication unit is notcurrently operating on the channel indicated by field 216.

In some demonstrative embodiments, multi-band control field 202 mayinclude one or more additional fields 212 to transfer any other suitableinformation to the recipient wireless communication device.

In some demonstrative embodiments, multi-band IE 200 may include aregulatory class field 218, e.g., having a size of one octet or anyother suitable size, to indicate a channel set of the second wirelesscommunication frequency band, for which multi-band IE applies, e.g.,based on suitable country, region and/or regulator domain requirements.

In some demonstrative embodiments, multi-band IE 200 may include a BSSidentification (BSSID) field 220, e.g., having a size of six octets orany other suitable size, to indicate a BSSID of a BSS, which includesthe wireless communication unit, on the second wireless communicationfrequency band. For example, BSSID field 220 may include a BSSID of anetwork, e.g., a BSS or PBSS, with which wireless communication unit 108(FIG. 1) is associated on the channel indicated by field 216, e.g., ifrole field 202 is set to zero. BSSID field 220 may include a BSSID usedby wireless communication unit 108 (FIG. 1) on the channel indicated byfield 216, e.g., if role field 202 is set to one. BSSID field 220 may bereserved and/or ignored, e.g., if channel active field 210 is set tozero. Channel active field 210 may be is set to one and BSSID field 220may be set to zero, e.g., to indicate that the wireless communicationunit is not associated on the channel indicated by field 216.

In some demonstrative embodiments, multi-band IE 200 may include a BIfield 222, e.g. having a size of two octets or any other suitable size,to indicate a BI length of the network over the second wirelesscommunication frequency band. For example, BI field 222 may include a BIlength used by the wireless communication unit while operating on thechannel indicated by field. 216, e.g., if role field 203 is set to one.BI field 222 may include to an observed BE of a PBSS or BSS with whichwireless communication unit 108 (FIG. 1) is associated on the channelindicated by field 216, e.g., if role field 203 is set to zero. BI field222 may include the value zero, e.g., if the wireless communication unitis not a member of a BSS or PBSS on the channel indicated by field 216.

In some demonstrative embodiments, multi-band IE 200 may include aTiming Synchronization Function (TSF) offset field 224, e.g., having asize of eight octets or any other suitable size, indicating, a TSFoffset between a first network, e.g., a BSS or PBSS, used by thewireless communication unit on the first wireless communicationfrequency band, and a second network, e.g., a BSS or PBSS, used by thewireless communication unit on the second wireless communicationfrequency band. For example, if the wireless communication unit is amember of a PBSS or BSS on both the channel indicated by field 216, andthe channel over which multi-band IE 200 is transmitted, then TSF Offsetfield 224 may include a time offset of the TSF of the first networkrelative to the TSF of the first network, e.g., in the form of a two'scomplement integer in microsecond units. TSF offset field 224 may be setto zero, e.g., if the wireless communication unit is not a member of aBSS or PBSS on both the first and second wireless communicationfrequency bands.

In some demonstrative embodiments, multi-band IE 200 may also include anelement identifier (ID) 230, e.g., having a size of one octet,identifying, multi-band IE 200; and a length field 232, e.g., having asize of one octet, indicating a length of multi-band IE 200.

Referring back to FIG. 1, in some demonstrative embodiments, wirelesscommunication unit 108 may coordinate with wireless communication device102 a session transfer timeout period corresponding to the at least onecommunication session between wireless communication devices 106 and102; and if wireless communication unit 108 cannot communicate withwireless communication device 102 over the first wireless communicationfrequency band for the session transfer timeout period, wirelesscommunication unit 108 may transfer the communication session from thefirst wireless communication frequency band to the second wirelesscommunication frequency band, e.g., as described below.

In some demonstrative embodiments, wireless communication unit 108 maytransmit to wireless communication device 102 a request frame includinga timeout field indicating the timeout period and at least one controlfield identifying at least one requested communication session, e.g., asdescribed below.

In some demonstrative embodiments, wireless communication unit 108 maytransmit the session-transfer frame after receiving over the firstwireless communication frequency band a multi-band IE from wirelesscommunication device 102, e.g., multi-band IE 200 as described abovewith reference to FIG. 2, indicating that wireless communication device102 is able to receive frames from wireless communication unit 108 overthe second wireless communication frequency band.

In some demonstrative embodiments, wireless communication unit 108 mayreceive a response frame from wireless communication device 102identifying at least one acknowledged session of the at least onerequested communication session. Based on the response frame, wirelesscommunication unit 108 may transfer only the at least one acknowledgedsession from the first wireless communication frequency band to thesecond wireless communication frequency band, e.g., as described below.

In some demonstrative embodiments, if wireless communication unit 108 isa member a network, e.g., a PBSS or a BSS, then when wirelesscommunication unit 108 transmits a session transfer request and/orresponse frame over a certain channel, wireless communication unit 108may include in the frame supported rates and/or supported channels whichwere transmitted during a most recent successful association exchange ina frequency band indicated by a most recently transmitted, multi-bandIE, which was transmitted over the certain channel.

In some demonstrative embodiments, wireless communication unit 108 mayinform other wireless communication devices in the network over thefirst wireless communication frequency band, e.g., wirelesscommunication device 105, that wireless communication unit 108 intendsto perform or has performed the session transfer. For example, wirelesscommunication unit may transmit a channel switch announcement frame oran extended channel switch announcement frame, e.g., as defined by theIEEE 802.11 specification, over the first wireless communicationfrequency band. After performing the session transfer, wirelesscommunication unit 108 (FIG. 1) may follow any suitable medium accessrules defined over the second wireless communication frequency band.

Reference is now made to FIG. 3, which schematically illustrates asession transfer request frame 300, in accordance with somedemonstrative embodiments. In one embodiment, session transfer requestframe 300 may be transmitted from a wireless communication device, e.g.,wireless communication device 106 (FIG. 1) or a wireless communicationunit, e.g., wireless communication unit 108 (FIG. 1), to a recipientwireless communication device, e.g., wireless communication device 102(FIG. 1), for example, to request to coordinate the session transfer ofat least one session between wireless communication device 106 (FIG. 1)and wireless communication device 102 (FIG. 1) from the first frequencyband to the second frequency band and/or vice versa.

In some demonstrative embodiments, request frame 300 may include one ormore fields in accordance with any suitable specification, e.g., acategory field 302 and/or an action field 304 in accordance with theIEEE 802.11 specification. For example, category field 302 may have avalue indicating that frame 300 relates to the session transferoperation; and/or action field 304 may have a value indicating thatframe 300 is session transfer request frame.

In some demonstrative embodiments, request frame 300 may include a LinkLost Timeout (LLT) field 306, e.g., having a size of 32 bits or anyother suitable size, indicating a LLT period for wireless communicationunit 108 and wireless communication device 102 to wait, if wirelesscommunication unit 108 and wireless communication device 102 cannotcommunicate with wireless communication device 102 over the firstwireless communication frequency band, prior to transferring thecommunication session from the first wireless communication frequencyband to the second wireless communication frequency band. For example,LLT field 306 may indicate a maximal time period, e.g., in microseconds,for wireless communication unit 108 (FIG. 1) to wait from a last time amessage, e.g., a MAC Protocol data unit (MPDU), was received by wirelesscommunication unit 108 (FIG. 1) from wireless communication device 102(FIG. 1) over the first frequency band, prior to performing the sessiontransfer. Wireless communication unit 108 (FIG. 1) may decrement the LLTvalue, for example, during periods of time that wireless communicationunit 108 (FIG. 1) expects to communicate, but is not able tocommunicate, with wireless communication device 102 (FIG. 1). Wirelesscommunication unit 108 (FIG. 1) may reset the LLT value to the initialLLT value, e.g., otherwise.

In some demonstrative embodiments, request frame 300 may include amulti-band IE corresponding, to the second wireless communicationfrequency band, e.g., multi-band IE 200 as described above withreference to FIG. 2.

In some demonstrative embodiments, request frame 300 may include one ormore, e.g., between one and sixteen or any other suitable number,session control fields 310. In some demonstrative embodiments, eachsession control field 310 may correspond to a session between wirelesscommunication unit 108 (FIG. 1) and wireless communication device 102(FIG. 1).

In some demonstrative embodiments, session control field 310 may includea session indication field 314 to indicate the session corresponding tosession control field 310. Session indication field 314 may include, forexample, a traffic identification (TID) of the session, e.g., inaccordance with the IEEE 802.11 specification, or any other suitableindicator.

In some demonstrative embodiments, session control field 310 may includea control field 312 indicating whether session transfer is requested tobe enabled or disabled for the session indicated by field 314. Forexample, control filed 312 may be set to a first value, e.g., one, toindicate that session transfer is requested to be enabled; and to asecond value, e.g., zero, to indicate that session transfer is to bedisabled.

Reference is now made to FIG. 4, which schematically illustrates asession transfer response frame 400, in accordance with somedemonstrative embodiments. In one embodiment, session transfer responseframe 400 may be transmitted from a wireless communication device (“theresponding device”), e.g., wireless communication device 102 (FIG. 1),in response to a session transfer request frame, e.g., frame 300 (FIG.3), from another wireless communication device (“the requestingdevice”), e.g., wireless communication device 106 (FIG. 1).

In some demonstrative embodiments, response frame 400 may include one ormore fields in accordance with any suitable specification, e.g., acategory field 402 and/or an action field 404 in accordance with theIEEE 802.11 specification. For example, category field 402 may have avalue indicating that frame 400 relates to the session transferoperation; and/or action field 404 may have a value indicating thatframe 400 is session transfer response frame.

In some demonstrative embodiments, response frame 400 may include amulti-band IE 406 corresponding to the operation of the respondingdevice on the second wireless communication frequency band, e.g.,multi-band IE 200 as described above with reference to FIG. 2.

In some demonstrative embodiments, response frame 400 may include one ormore, e.g., between one and sixteen or any other suitable number,session control fields 410 corresponding to the session control fields310 (FIG. 3) of the request frame 300 (FIG. 3).

In some demonstrative embodiments, session control field 410 may includea session indication field 414 to indicate the session corresponding tosession control field 410. Session indication field 414 may include, forexample, a traffic identification (TID) of the session, e.g., inaccordance with the IEEE 802.11 specification, or any other suitableindicator.

In some demonstrative embodiments, session control field 410 may includea control field 412 indicating whether session transfer is acknowledgedto be enabled or disabled for the session indicated by field 414. Forexample, control filed 412 may be set to a first value, e.g., one, toindicate that session transfer is acknowledged to be enabled; and to asecond value, e.g., zero, to indicate that session transfer is to bedisabled.

Reference is now made to FIG. 5, which schematically illustrates amethod of transferring a wireless communication session between firstand second wireless communication frequency bands, in accordance withsome demonstrative embodiments. In one embodiment, one or moreoperations of the method of FIG. 5 may be performed by one or moreelements of a system, e.g., system 100 (FIG. 1), for example, one ormore wireless communication devices, e.g., wireless communicationdevices 102 and/or 106 (FIG. 1), and/or a wireless communication unit,e.g., wireless communication unit 108 (FIG. 1).

As indicated at block 502, the method may include coordinating a sessiontransfer timeout period between first and second multiband wirelesscommunication devices capable of communicating over at least first andsecond wireless communication frequency bands, wherein the sessiontransfer timeout period corresponds to at least one communicationsession between the first and second wireless communication devices. Forexample, wireless communication unit 108 (FIG. 1) may coordinate a LLTperiod with wireless communication device 102 (FIG. 1), e.g., asdescribed herein.

As indicated at block 504, the method may include transferring the atleast one communication session from the first wireless communicationfrequency band to the second wireless communication frequency band,e.g., if the first wireless communication unit cannot communicate withthe second wireless communication device over the first wirelesscommunication frequency band for a time period of at least the sessiontransfer timeout period. For example, wireless communication unit 108(FIG. 1) and wireless communication device 102 (FIG. 1) may transfer theat least one session from the 2.4/5 GHz frequency band to the 60 GHzfrequency band and/or vice versa, e.g., as described herein.

As indicated at block 510, the method may include transmitting a requestframe from the first wireless communication device to the secondwireless communication device. The request frame may include a timeoutfield indicating the timeout period and at least one control fieldidentifying at least one requested communication session. For example,wireless communication unit 108 (FIG. 1) may transmit request frame 300(FIG. 3) to wireless communication device 102 (FIG. 1), e.g., asdescribed above.

As indicated at block 512, the method may include receiving a responsefrom the second wireless communication device.

In some demonstrative embodiments, the response may include a responseframe identifying at least one acknowledged session of the at least onerequested communication session. For example, wireless communicationunit 108 (FIG. 1) may receive response frame 400 (FIG. 4) from wirelesscommunication device 102 (FIG. 1), e.g., as described above. Accordingto these embodiments, as indicated at block 505, transferring the atleast one session from the first wireless communication frequency bandto the second wireless communication frequency band may includetransferring only the at least one acknowledged session from the firstwireless communication frequency band to the second wirelesscommunication frequency band. For example, wireless communication unit108 (FIG. 1) and wireless communication device 102 (FIG. 1) may transferthe at least one acknowledged session from the 2.4/5 GHz frequency bandto the 60 GHz frequency band and/or vice versa, e.g., as describedherein.

As indicated at block 506, the method may include transmitting amulti-band IE from the first wireless communication device to the secondwireless communication device over the first wireless communicationfrequency band. The multi-band IE may include, for example, a role fieldindicating whether or not the first wireless communication deviceoperates as a controller over the second wireless communicationfrequency band; and/or a reachability field indicating whether or notthe first wireless communication device is able to receive frames fromthe second wireless communication device over the second wirelesscommunication frequency band. For example, wireless communication unit108 (FIG. 1) may transmit multi-band IE 200 (FIG. 2) to wirelesscommunication device 102 (FIG. 1) over the first wireless communicationfrequency band, wherein the transmitted multi-band IE includesinformation corresponding to the operation and/or functionality ofwireless communication unit 108 (FIG. 1) over the second wirelesscommunication frequency band, e.g., as described above. The firstwireless communication device may transmit the multi-band IE as part ofthe request frame and/or as part of any other suitable frame ortransmission, e.g., as described above.

As indicated at block 508, the method may include receiving from thesecond wireless communication device a multi-band IE, e.g. over thefirst wireless communication frequency band, wherein the receivedmulti-band IE includes information corresponding to the operation and/orfunctionality of the second wireless communication device over thesecond wireless communication frequency band. For example, wirelesscommunication unit 108 (FIG. 1) may receive multi-band IE 200 (FIG. 2)from wireless communication device 102 (FIG. 1) over the first wirelesscommunication frequency band, wherein the received multi-band IEincludes information corresponding to the operation and/or functionalityof wireless communication device 102 (FIG. 1) over the second wirelesscommunication frequency band, e.g., as described above. The firstwireless communication device may receive the multi-band IE as part ofthe response frame and/or as part of any other suitable frame ortransmission, e.g., as described above.

In some demonstrative embodiments, the method may include using a firstMAC address to identify the first wireless communication device duringthe at least one session over the first second wireless communicationfrequency band; and using a second MAC, different from the firstmedia-access-control address, to identify the first wirelesscommunication device during the at least one session over the secondwireless communication frequency band. For example, wirelesscommunication unit 108 (FIG. 1) may perform a non-transparent sessiontransfer by using a first MAC address for communicating with wirelesscommunication device 102 (FIG. 1) over the first wireless communicationfrequency band, e.g., for transmitting the multi-band IE and/or thesession transfer request frame; and a second MAC address, different fromthe first MAC address, for communicating with wireless communicationdevice 102 (FIG. 1) over the second wireless communication frequencyband, e.g., as described above. According to these embodiments, asindicated at block 505, the first wireless communication device maytransmit the multi-band IE to the second wireless communication device,wherein the multi-band IE includes the second MAC address. For example,wireless communication unit 108 (FIG. 1) may transmit multi-band IE 200(FIG. 1) including the second MAC address in field 214 (FIG. 2), e.g.,as described above.

In some demonstrative embodiments, the method may include using a firstMAC address to identify the first wireless communication device duringthe at least one session over the first second wireless communicationfrequency band, and using the first MAC address to identify the firstwireless communication device during the at least one session over thesecond wireless communication frequency band. For example, wirelesscommunication unit 108 (FIG. 1) may perform a transparent sessiontransfer by using the same MAC address for communicating with wirelesscommunication device 102 (FIG. 1) over both the first and secondwireless communication frequency band, e.g., as described above.

Reference is made to FIG. 6, which schematically illustrates an articleof manufacture 400, in accordance with some demonstrative embodiments.Article 600 may include a machine-readable storage medium 602 to storelogic 604, which may be used, for example, to perform at least part ofthe functionality of wireless communication unit 108 (FIG. 1), wirelesscommunication device 102 (FIG. 1), and/or wireless communication device105 (FIG. 1); and/or to perform one or more operations of the method ofFIG. 5.

In some demonstrative embodiments, article 600 and/or machine-readablestorage medium 602 may include one or more types of computer-readablestorage media capable of storing data, including volatile memory,non-volatile memory, removable or non-removable memory, erasable ornon-erasable memory, writeable or re-writeable memory, and the like. Forexample, machine-readable storage medium 602 may include, RAM, DRAM,Double-Data-Rate DRAM (DDR-DRAM), SDRAM, static RAM (SRAM), ROM,programmable ROM (PROM), erasable programmable ROM (EPROM), electricallyerasable programmable ROM (EEPROM), Compact Disk ROM (CD-ROM), CompactDisk Recordable (CD-R), Compact Disk Rewriteable (CD-RW), flash memory(e.g., NOR or NAND flash memory), content addressable memory (CAM),polymer memory, phase-change memory, ferroelectric memory,silicon-oxide-nitride-oxide-silicon (SONOS) memory, a disk, a floppydisk, a hard drive, an optical disk, a magnetic disk, a card, a magneticcard, an optical card, a tape, a cassette, and the like. Thecomputer-readable storage media may include any suitable media involvedwith downloading or transferring a computer program from a remotecomputer to a requesting computer carried by program requesting datasignals embodied in a carrier wave or other propagation medium through acommunication link, e.g., a modem, radio or network connection.

In some demonstrative embodiments, logic 604 may include instructions,data, and/or code, which, if executed by a machine, may cause themachine to perform a method, process and/or operations as describedherein. The machine may include, for example, any suitable processingplatform, computing platform, computing device, processing device,computing system, processing system, computer, processor, or the like,and may be implemented using an suitable combination of hardware,software, firmware, and the like.

In some demonstrative embodiments, logic 604 may include, or may beimplemented as, software, a software module, an application, a program,a subroutine, instructions, an instruction set, computing code, words,values, symbols, and the like. The instructions may include any suitabletype of code, such as source code, compiled code, interpreted code,executable code, static code, dynamic code, and the like. Theinstructions may be implemented according to a predefined computerlanguage, manner or syntax, for instructing a processor to perform acertain function. The instructions may be implemented using any suitablehigh-level, low-level, object-oriented, visual, compiled and/orinterpreted programming language, such as C, C++, Java, BASIC, Matlab,Pascal, Visual BASIC, assembly language, machine code, and the like.

Functions, operations, components and/or features described herein withreference to one or more embodiments, may be combined with, or may beutilized in combination with, one or more other functions, operations,components and/or features described herein with reference to one ormore other embodiments, or vice versa.

While certain features of the invention have been illustrated anddescribed herein, many modifications, substitutions, changes, andequivalents may occur to those skilled in the art. It is, therefore, tobe understood that the appended claims are intended to cover all suchmodifications and changes as fall within the true spirit of theinvention.

What is claimed is:
 1. A first device for wireless communication,comprising: a processor, a memory, an input, an output, an antenna, anda wireless communication unit, the first device including a plurality ofmedia-access-control (MAC) addresses and being configured to communicateover first and second wireless communication frequency bands, whereinthe first device is to: transmit, over the first wireless communicationfrequency band to a second device using a first one of the plurality ofMAC addresses, an information element (IE) having (a) a MAC addressindicator field to identify whether the IE includes a MAC address fieldand (b) a timing synchronization function (TSF) offset field to identifya TSF offset value between the first and second wireless communicationfrequency bands; select a second one of the plurality of MAC addressesassociated with the MAC address field for identifying the wirelesscommunication unit over the second wireless communication frequency bandduring a session with the second device when the MAC address indicatorfield has a first value; and use the first one of the plurality of MACaddresses for identifying the wireless communication unit over thesecond wireless communication frequency band during the session when theMAC address indicator field has a second value.
 2. The first device ofclaim 1, further including transferring the session by transmitting asession-transfer request to the second device and receiving asession-transfer response from the second device.
 3. The first device ofclaim 1, further including receiving a session-transfer request from thesecond device and transmitting a session-transfer response to the seconddevice.
 4. The first device of claim 1, wherein the first wirelesscommunication frequency band includes one frequency band selected fromat least one of a 60 gigahertz frequency band, a 2.4 gigahertz frequencyband, or a 5 gigahertz frequency band, and wherein the second wirelesscommunication frequency band includes another frequency band selectedfrom at least one of the 60 gigahertz frequency band, the 2.4 gigahertzfrequency band, or the 5 gigahertz frequency band.
 5. The first deviceof claim 1, wherein the first device includes at least one of: 1) akeyboard, 2) a screen, or 3) an audio speaker.
 6. The first device ofclaim 1, wherein the first one of the plurality of MAC addresses isdifferent than the second one of the plurality of MAC addresses.
 7. Amethod of wireless communication, comprising: transmitting, from a firstwireless communication device over a first wireless communicationfrequency band to a second wireless communication device using a firstone of a plurality media-access-control (MAC) addresses, an informationelement (IE) having (a) a MAC address indicator field to identifywhether the IE includes a MAC address field and (b) a timingsynchronization function (TSF) offset field to identify a TSF offsetvalue between the first wireless communication frequency band and asecond wireless communication frequency band; selecting a second one ofthe plurality of MAC addresses associated with the MAC address field toidentify a wireless communication unit of the first wirelesscommunication device over the second wireless communication frequencyband during a session with the second wireless communication device whenthe MAC address indicator field has a first value; and using the firstone of the plurality of MAC addresses to identify the wirelesscommunication unit over the second wireless communication frequency bandduring the session when the MAC address indicator field has a secondvalue.
 8. The method of claim 7, further including transferring thesession by transmitting a session-transfer request to the secondwireless communication device and receiving a session-transfer responsefrom the second wireless communication device.
 9. The method of claim 7,further including receiving a session-transfer request from the secondwireless communication device and transmitting a session-transferresponse to the second wireless communication device.
 10. The method ofclaim 7, wherein the first wireless communication frequency bandincludes one frequency band selected from at least one of a 60 gigahertzfrequency band, a 2.4 gigahertz frequency band, or a 5 gigahertzfrequency band, and wherein the second wireless communication frequencyband includes another frequency band selected from at least one of the60 gigahertz frequency band, the 2.4 gigahertz frequency band, or the 5gigahertz frequency band.
 11. The method of claim 7, wherein the firstone of the plurality of MAC addresses is different than the second oneof the plurality of MAC addresses.
 12. A non-transitory machine-readablestorage medium having instructions stored thereon, wherein theinstructions, when executed by a machine, cause the machine to performoperations comprising: transmitting, from a first wireless communicationdevice over a first wireless communication frequency band to a secondwireless communication device using a first one of a plurality ofmedia-access-control (MAC) addresses, an information element (IE) having(a) a MAC address indicator field to identify whether the IE includes aMAC address field and (b) a timing synchronization function (TSF) offsetfield to identify a TSF offset value between the first communicationfrequency band and a second wireless communication frequency band;selecting, by the first wireless communication device, a second one of aplurality of MAC addresses associated with the MAC address field foridentifying a wireless communication unit of the second wirelesscommunication device over the second wireless communication frequencyband during a session with the second wireless communication device whenthe MAC address indicator field has a first value; and using the firstone of the plurality of MAC addresses for identifying the wirelesscommunication unit of the second wireless communication device over thesecond wireless communication frequency band during the session when theMAC address indicator field has a second value.
 13. The medium of claim12, further including transferring the session by transmitting a requestto the second wireless communication device and receiving a responsefrom the second wireless communication device.
 14. The medium of claim12, further including receiving a request from the second wirelesscommunication device and transmitting a response to the second wirelesscommunication device.
 15. The medium of claim 12, wherein the firstwireless communication frequency band includes at least one of a 60gigahertz frequency band, a 2.4 gigahertz frequency band, or a 5gigahertz frequency band, and wherein the second wireless communicationfrequency band includes another of the 60 gigahertz frequency band, the2.4 gigahertz frequency band, or the 5 gigahertz frequency band.
 16. Themedium of claim 12, wherein the first one of the plurality of MACaddresses is different than the second one of the plurality of MACaddresses.